No, this is currently not possible. For now, you can export all your users, and then - using LibreOffice or MS Excel - filter on your local PC.
Please contact me via email or the via the forum, so we can discuss your feature request.
Only problem I have is that sometimes the lightbox effect works and sometimes it doesn't. Un-installed etc, but can't figure this one out. IE 7, 8, Safari and FF.
Checking out the forums at http://forum.joomlaworks.gr/index.php?board=6.0 but not able to find solution yet. Hope this one gets solved since the support seems to be very active.
One little remark that made me choose 4 stars. When someone pays for a component the support should be a bit more active. Please speed up the help in the forum.